ASoC: atmel: sam9x5_wm8731: use devm_snd_soc_register_card()

Using devm_snd_soc_register_card() can make the code
shorter and cleaner.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210602141619.323286-1-yangyingliang@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/atmel/sam9x5_wm8731.c

@@ -159,7 +159,7 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 	of_node_put(codec_np);
 	of_node_put(cpu_np);
 
-	ret = snd_soc_register_card(card);
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret) {
 		dev_err(&pdev->dev, "Platform device allocation failed\n");
 		goto out_put_audio;
@@ -180,7 +180,6 @@ static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct sam9x5_drvdata *priv = card->drvdata;
 
-	snd_soc_unregister_card(card);
 	atmel_ssc_put_audio(priv->ssc_id);
 
 	return 0;